Ellipsograph.



F. KIRK & L. E. FRANCISCO.

ELLIPSOGRAPH.

APPLICATION FILED JUNE 4, 1915.

7 1,168,081, Patented Jan.11, 1916.,

3 SHEETS-SHEET I.

WlT/VESSES: fin/w in l/alga fi fieqle'e fi. [fa/2422900 M.

\\ ATTORNEYS F. KIRK & L. E. FRANCISCO.

ELLIPSOGRAPH.

APPLICATION FILED JUNE 4, I915. 1 168 081 Patented Jamll, 1916.

9 9 l 3 SHEETS-SHEET 2- A TTOR/VEYS COLUMBIA PLANOGRAPH COQWASHINGTON, D c.

F. KIRK & L. E. FRANCISCO.

ELLIPSOGRAPH.

APPLICATION FILED JUNE 4. 1915.

Patented Jan. 11, 1916.

3 SHEETS-SHEET 3.

a -if? q v ATTORNEYS UNITED sTA Es PATENT onn on.

FRANK 'KIBK AND- LESLIE n. .rnanoiseo, or

CANON CITY,- coLoRA no, ASSIGNORS or ONE-FOURTH TO TIMOTHY S(ILLIVAN AND ONE-FOURTH TO JOHN COX, BOTH QF ennon crrY, COLQRADO.

To all-MommyWear 5 Be itknown .that we, FRANK KIRK and LESLIE E, FRANCISCO, citizens of the United f States, and residents of Canon City, in the county of Fremont and State of Colorado, have invented a new and useful Improvemen't inrEllipsographs, of which the follow ing iswa specification. i

Our invention is an improvement in ellipsograp'h's, and the invention has for its object to provide a device of the character specified, designed for use by draftsmen and others, for drawing perfect ellipses, wherein a table j' is provided andl a carriage having guided :movement on the table, together with an arm mo'vabletr'ansversely ofthe tableand prov ided with marking: means, and "connected to the table in such manner that the combined movement of the arm and the table willpermit the drawing of a perfect ellipse. In the drawings: Figure 1 is a perspective view of the ellipsograph with the parts in one p'osition, Fig." '2' is a partial plan view, Figs. '3 and t are sections on the lines 33 ands- 1, respectively, of'Fig. 2,"looking in the direction of the arrows adjacent to the line, Fig. .5 i's a-perspective view of the amounting-of thefa-rm with'the parts separated}, Fig. 6 i's 'aside view of one of the drawing arm supporting standards 'detacihed, Fig. 7 is a secti'onionthe'line 7 7 of Fig. '6,

' Fig. 8 i'sa perspective view of a modified construction, Fig 9 is a section. on the line S -9 9i Fig. 10, Fig. 10 is a section on the "lin'e'lO'-'1O of 9, "is a partial top pla n viewof the draftingrarm, and Fig. 12 isa si'de view'of Fig.1.1;

= '-'In the embod'ment of the invention shown in Figs. 1 to 7 in'clusive,'j the ellipsograph comprises a table in the form of a plate 1 of snitablematerial, the said plate having depending pointed spurs or lugs 2, on its under face for engaging a supportingsurface' 3, as

' for instance, a table,- to prevent movement of the plate with respect to the table. -The 'plate'l 1s also'provi'ded at each side edge with an upstanding flange or rib at, the said flanges or ribs extending longitudinally of' the plate, and just inside each rib the plate is provided with a series of rack teeth 5, the teeth extending the full length of the plate and' the teeth of the series registering.

' A carriage is mountedto travel longitudinally of the table, the said carriage comprising spaced siflde plates 6, each plate have fand'llspace the side plates so that'th'ey ELLIFSOGRAPH.

Specification of Letters Patent. .Patentd Jan, 11, 1916, Application filed'June 4, 1915. Serial No. 32,089.

ing. at one end an angular web 7, extending inwardly,-'and provided at its inner end with "a lug 8, extending parallelwith the body ofthe plate but inwardly offset from the body. The lugs 8 and the plates 6 have registering openings for receiving a rod or shaft 9, thesaid rod or shaft being'held by the plates and the lugs in a position trans- Verse to the table 1, and pinions 10' are .mountedon the shaft between the plates and their respective lugs, and each pinion is adapted to engage the adjacent series of rack teeth. The plates 6 are connected at their opposite ends by a. rod 11, and the rods 9 will move just inside of the ribs 4 of the plate or table 1. Each plate 6 is provided at approximately its center with an upright or standarda'12', the said standards being in register transverselyof the table, and the standards have registering slots 13 and 1d, the slots 13 being near the tops of the standards, while the slots 14 are near the bottom.

The drawing arm is-mounted to move in the slots, and the said arm comprises connected upper and lower bars or portions 15 and 16, the said portions being connected at one end by an integral 'web. The said bars 15 and 16'are parallel or approximately so, and the bar 15 is longitudinally slotted as shown at .18. The bar 15 engages the slots .13 of the standards'12, while the portion orbar'lG engages the slots 14 of the standards 12.

A roller 19 is ournaled'just below'the slot 13 ofthe :front standard, the said roller having a shaft 20, which is journaled in bearing "lugs 21 at opposite sides of the standard,

and outside of one of the; lugs the shaft is provided with ahead or button 22, for per- 1 :mitting the roller to beturned when desired. This roller has its upper surface in position to engage the under surface of the bar 15, and the-said bar is provided at its outer end with a split'bear'ing 23, for receiving a penoil 2 1 or the like; The bearing may. be

clampedupon the pencil by means of a set screw .25, the said set screw being journaled in one .of the sides ofcthe bearing as shown in Fig.2, and-having a threaded engagement with the other side.

It will be evident that when the set screw is turned in the proper direction, the "bearing will be clamped upon the pencil, and by loosening the said screw ithexpenpcil may be adju'sted to the proper position with respect to the sheet 26, upon which the drawing is to be placed. This sheet as shown, is arranged in proper position on the table 3 or other support for the ellipsograph, and the sheet may be held to the table by means of thumb tacks 27 The bar 16 of the drafting arm is provided with a transversel extending guideway, to be later described its center, the said guideway extending longitudinally of the table, and the mechanism shown more particularly in Figs. 1 and 5, is supported by the guideway. The said mechanism comprises a guide bar 28, having in its upper face an undercut longitudinally extending groove 29 and having in each side a longitudinally extending groove 30, and the grooves 30 are in register, and together with the groove 29 extend the full length of the bar 28 opening at the ends of the said bar.

The groove 29 of the bar 28 forms a guideway for receiving a slide block 31, the said block as shown in Fig. 5, being shaped to fit the groove, and a crank arm 32 is connected with the block by means of a threaded stem 33, secured to the arm at one end thereof and passing through the bar 15 into threaded engagement with the slide block. It will be evident that by turning the crank arm in the proper direction the bar 15 may be clamped to the bar 28 or released therefrom. When the crank arm 32 is turned in the proper direction the nut or slide block 31 is forced upwardly into close contact with the undercut walls of the groove.

The grooves 30 are engaged by inwardly extending ribs as on the side walls 35 of one of the channel shaped sections of a connector consisting of the section 36 and a section 36 integrallv connected as shown more particularly in Fig. 4c by web 37, which is at the centers of the bodies of the connector. The section 36" has side walls 35 each of which is provided at its outer edge with an inwardly extending rib 3 1, corresponding in arrangement to the ribs 34.

The section 36 of the connector is precisely the same as the connection 36*, but the said sections are reversed or oppositely arranged with respect to each other, the channel of the section 36 facing upward, while the channel of the section 36 faces downward. The ribs 34 of the section 36 engage the grooves 30 of the bar 28 with the body portion 36 of the section below the bar.

A set screw 38 is passed through one of the sides 35 of the upper section 36 into engagement with the bar 28, to hold the connector in adjusted position with respect to the bar, and a similar screw 38 is passed through the side wall of the section 36 into engagement with the side edge of a strap or plate 39, mounted to slide in the channel of the section 36 By means of at approximately v the set screw 38 the strap or'bar 39 may be held in adjusted position with respect to the connector and with respect to the bar 28.

The integral connection 37 between the sections of the connector moves in a slot 40, extending longitudinally of the guideway 41, before mentioned, which is interposed in the length of the bar 16. The strap or bar 39 is provided near one end with a depending socket 42, which is adapted to fit over a post 43, secured to the table '1. This post as shown in Fig. L, extends upwardly into engagement with the opening of the socket, and the post is rigid with the table. A pin 45 is passed downwardly through the registering openings in the bar and in the strap or bar 39, the pin passing through the slot 40 of the guideway a1, and the pin has a head as shown, for convenience in manipulating the same.

This pin 45 and the connector or connecting sections 3636- hold the bars 2839 in rigid register or parallelism with each other. It will be noticed from an inspection of Figs. 1 and 5 that the bar 28 is provided with graduations 4.4 on its upper face at one side of the groove 29 and on one side face above the groove 30.

In operation, should for instance the operator desire to draw an ellipse having a long axis of six inches and a short axis of four inches, he will proceed as follows The handle 32 is first turned to loosen the nut or slide block 31 in the groove 29, and this block is set in the groove 29 to the proper graduation of the scale M, after which the block is tightened in the slot. The block 31 is set at that graduation denoting half the short axis of the ellipse to be drawn, in the present instance, the graduation designated by the numeral 2. The set screw 38 is then loosened. and the connector 36-36 is moved tothat graduation bearing the numeral 3, that is, the numeral corresponding to half the length of the desired ellipse. The set screw 38 is then tightened and the instru ment is ready for use. The operator now places the table 1 on the table 3 in such position that the lugs 2, which are in alinement transversely of the plate 1, will be in the extension of the long axis of the ellipses.

These lugs 2 are at the exact center of the bar 15, and in alinement with the point of the pen or pencil 28. The lugs 2 are then pressed into the material of the table top 3, thus anchoring the plate in proper position with respect to the sheet 26. The plate 1 is anchored at such position with respect to the sheet that when the pencil point is at the end of the long axis adjacent to theplate 1 the handle 32 will be directly above the drafting bar 15 and parallel therewith, and extending in the opposite direction from the pencil or pen. The handle 32 is now turned to the right, and since the arm 32, the bars 28, 15 and 16, are locked rigidly to the strap 30 ter, and as the arm 32qcompletes the circle, the .third and fourth quarters will be d-raWn.

55 Y 'gui'deway having theislot 59 correspond- ,in-gs.

a; standard or upright atapproximately its center, thev standards corresponding-to onpjlate, 39, it will be evident-thatz'whemthe handle isturnedthisentire-construction will revolve about the post 43. The bars 15 and 16' slide smoothly: through the slots 13 and 14,. and .thecarriage as :a. -w11o1e,;r( 11s smoothly on the tracks constituted by, the rack bars 15. The: pinionsrIO cOnStrain-the carriage to hold a certain predeterminedffand definite position with. respectv to the table (hiring this movement. As .the rarmj 32z-is turned to the right the-stem 33-W1l1. move the sliding block or nut-31-upW-ard,-;gradually clamping the crank arm: to "the bar, and

further movement of the arm =w-i11.-betransmittedto the carrier, constituted vloy-the loars 28-39 :and connected parts. Since the crank arm 32 is in register with the'loarv 15 at the commencement of itsamovement, this continued movement 1 will move the drafting arm 15 outward or away from 'thet'able 1.

At the same time-the clip 36-036 is moving longitudinally. of the guideway ll-to cause the pen or pencil to move laterally. This combined lateral and outward movement forms the outline48 of the ellipse and a quarter. turn/of thearm 32, will'ca-use the pencil to outline a quarter of the ellipse moving from the inner end of the longaxis 46 tonne end of the short-axis 47. Continned movement will draw the sec'ond quar- It will be understood that the operation of drawing is continuous. 35

In the embodiment of the invention shown in Figs. 8 to 12, a frame 4C9 of substantially rectangular form is provided, thesaidframe .being'open as shownforthe sake oflightness, and having a 'crossbarl50 at approximately its center. Guide rails51' of circulartcross. section are anounted on the table .at the opposite; sides thereof, and parallel with each. other, andracarriage comprising side members 52 and 'connecting'cross rods 53, risflmounted to slide on. the ra1ls251. Each of the "side members' 521 is provided with bearin'gs54: at its "ends for engaging ithe rails; and the'cross rods53 connect tliehear- Eachsi'demember is provided with the standards 12 'of Fig. 1.

The drafting arm comprises the upper .bar -56and a lower bar 57 having the transverse guideway 58, at approximately its centerathe ing to the slot 40015 the, guideway 41 of Fig. 1. The bar v56 moves in registering slots-60, near the upper ends .of'the standards, and the'bar is longitudinally slotted,as shown at 61. The bar 57 of the drafting arm moves in slots 62 in the standards, the said slots beingju'st-below the slots 60, and the Rbars 5.6 .and57 are connected atone end by the integral web 63. The bar 56 is provided at 'the':-end=-remotefrom-the 'webvwitlr a vertical opening f-Or receiving the;pen o1:' *pencil 64, and-this; peneor pencil isheld in place by a substantially ou 'shaped cl-ip: '65. A. The awns of the -"clipengageabove and below the-outer end of the bar -56," the said' end loeing --:en- I larged as shown at; 56= :to iit the arms;=j-and the openings 66-i n the ar-ms of the clip s threaded through the body. not

registering grooves 70' in its opposite side faces. A crank arm 711's arranged above the bar "56, the sai-d arm having a threaded stem 73,' engaiging"aslidegbloek-ornut 74: in-the ggIOOVB 69 0f the block 68. The connecting clip .75"corresponds to the clip 36'36 ,-in -that it composed of two oppositely arranged channel shaped members, having :theirr'loody; portions connected by the inte- :gral connecting pin 76, and this pin extends through the slot 59 of the guidewayf58. The lower portion of the olip embraces a strap or *pla-te 7-7, corresponding to the strap or plate 39' ofl3":ig. 1, and the cl'ip isarranged to loeclamped to the bar 68 andthefl strap 77, by means of cam levers 78, each'ofwhic'h is .pivoted to :a bearing lug =79, connected with theadjacent' settion 'o'f' the clip, by

means of a pi'votipimor jrivet 80. Thestmp "77 is pivotally connected to the table 1 or frame 4e9 in the same-"manneras the "strap -39?-beforeimentioned,=and the"bar 57 'o'f t{li'e drafting arm 1 is s up'ported' by a roller 81,

journal'ed "in beari'rig lugs 82 ont'he 'fi-orit standard f5j5; and thei shaft (if the- EOHG'I" has a button 83, for convenience in manipulat i-ng the'rol'ler. I V The :operation of the construction jfust' described, is p'recisely the-"same as that 0f the construction-shown in Figs. 1 to 7, and i the bar 68 is provided with graduations as shown Figra w permitthzeadjustment6f the parts for tlie f ellipse desired. In "this construction the-carriage moves on the guide rails 51', -instead0f having the rack and pinion conn'ecti'on. Tlie'table or frame 49 is provided "with the pointed spurs or 'lu'gs', not 'shownfcorresponding to "the lugs '2, of

Figs. 1 to 7, -for permitting the "Erm ne or table to lee-anchored at the-proper "position with respect to the sheet upon which the ellipseis to be drawn:

The improved ellipsograpk-is capable of drawing an ellipse so broad'as to be pracrotation of the handle is necessary in the may be of any desired size, depending the use to which it is to be put.

formation of an ellipse. The machine may be made of sheet metal as forinstanoe, German silver, aluminum, steel, or the like, and upon To pack. the machine for transportation the handle should be set in a position lengthwise of the machine. The socket 42 is then released from the pin 43 by lifting the carriage upward, after which the drafting arm 1516 is turned lengthwise of the machine, and the carriage is replaced between the ribs 4:. The said plates 6 of the carriage are of a length to fit between the ribsit when the drafting arm extends longitudinally of the table. When the carriage is replacedafter turning it transverse to the table the socket 42 is again engaged with the pin43 to hold the carriage in place.

- t will be understood also that the ellipsograph will draw a circle or an oval of any size within the capacity of the particular instrument. The roller 81 is for use in making dotted or broken lines. The roller is eccentrically arranged so that by turning the button or head 83 the drawing arm may be lifted to bring the pencil out of contact with the paper or to permit it to contact with the paper. V v We claim z- 1. An ellipsograph, comprising a table having longitudinally extending guides at its opposite side edges, a carriage mounted to move on the guides, said carriage comprising connected side plates, each plate having a standard intermediate its ends and .the standards being in register and having registering slots, a drafting arm mounted to slide in the standards and comprising upper and lower bars spaced apart vertically and approximately parallel andvmovablein the slots, said bars being connected at one end, and the upper bar having a longitudinally extending slot and extending .bevond the lower bar at the opposite end, said bar having at the extended ends means for clamping apencil to the bar, and the table having depending spurs or lugs in alinement with the point of a pencil supported by the drafting arm for engaging the supporting surface for the table to anchor the table to the said surface, the lower bar of the drafting arm having a transverse guide way provided with a longitudinal slot, a bar arrangedabove the guideway and beneath the upper bar, a strap arranged below the guideway, a clip connecting the bar and the strap and having a pin extending through the slot of the guideway, said clip being slidable with respect to the bar and the strap, and means for rigidly connecting the clip to the bar and to the strap, a detachable pivotal connection between the strap and the table at the end remote from the clip, said bar having'infits upper face an underout longitudinally extending groove, a slide block fitting the grooves and having a threaded opening, and a crank arm having '-a threaded stem passing through the slot" of the upper bar and'engaging thethreaded opening of the slide'blo'ck, said bar having graduations with which the clip and block cooperate as indicators. 2. An ellipsograph, comprising a' table having guides at its opposite sides, a cardrafting arm comprising upper and lower portlons connected at one end and mounted 'riage mounted to move on the guides, a

upper portion of the arm having means at:

the end remote from the connection for clamping a pencil to the said portion, the lower portion of the arm having a slotted guideway intermediate its ends and eXtenda strap arranged below the lower portion of the arm and having a detachable pivotal connection with the table at one end, a bar arranged between the portions of the arm and having a scale and connected to the strap at the end adjacent to the pivotal connection of'the strap, a connector connecting the bar to the strap at the opposite end from the pivotal connection and slidable with remeans for securing the connector to the bar and to the strap, said connector moving in the slot of the guideway and a common means adjustable with respect to the bar for clamping the upper portion of the arm to ing transversely of the portion of the arm,

:spect to the bar and the strap and having end with means for clamping a pencil to the arm, a strap having a detachable pivotal connection with the table at one side of the arm, a bar arranged above the strap and connected with the strap at the end adjacent to the pivotal connection of the strap,

a guideway in connection with the drafting arm and extending transverselythereof and rigid with the arm, a connection between the bar and the strap at the opposite end from the pivotal connection of the strap and extending through the guideway and adjustable with respect to 'thebar and the strap toward and from the pivotal connec 131011, and a common means for clamping the arm to the bar and for swinging the strap on its pivotal connection and adjustable with respect to the bar.

4. An ellipsograph, comprising a'table, a carriage movable longitudinally of the table and having guided movement on the table, a drafting arm mounted to slide. transversely of the carriage and provided at one end with means for clamping a pencil to the arm, a strap having a detachable pivotal connection with the table at one side of the arm, a guideway extending transversely of the arm at the strap, a bar adjustable transversely of the arm at the strap and connected to the strap at the end adjacent to the pivotal connection, means adjustable with respect to the strap and the bar for connecting the strap and the bar to constrain them to move together, said means passing through the guideway, and means for swinging the strap and the bar on the pivotal connection of the strap, said means being adjustably connected with the bar and detachably connected with the arm.

5. An ellipsograph, comprising a table, a drafting arm arranged transversely of the table, a carriage movable longitudinally of the table and having guides for the arm, said arm having a transverse guideway, a strap pivoted to the table at one end of the strap and at one side of the arm, a bar arranged above the guideway and connected to the strap at the end adjacent to the pivotal connection thereof, means adjustable with respect to the strap and the bar and passing through the guideway for rigidly connecting the bar and the strap, and a common means for swinging the bar and the strap and for clamping the arm to the bar. 6. An ellipsograph, comprising a support,

a carriage having guided movement longitudinally of the support, a drafting arm movable transversely of the carriage, a swinging connection between the arm and the support for constraining the free end of the arm to describe an ellipse, said connection being adjustable with respect to the arm for varying the extent of the swinging movement of the free end of the arm, and means for swinging the arm.

FRANK KIRK.

LESLIE E. FRANCISCO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, D. G. 

